x^2-6x-51=0

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Solution for x^2-6x-51=0 equation:


Simplifying
x2 + -6x + -51 = 0

Reorder the terms:
-51 + -6x + x2 = 0

Solving
-51 + -6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + -6x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + -6x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + -6x + x2 = 0 + 51
-6x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
-6x + x2 = 51

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 51 + 9

Reorder the terms:
9 + -6x + x2 = 51 + 9

Combine like terms: 51 + 9 = 60
9 + -6x + x2 = 60

Factor a perfect square on the left side:
(x + -3)(x + -3) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(x + -3) equal to 7.745966692 and -7.745966692.

Subproblem 1

x + -3 = 7.745966692 Simplifying x + -3 = 7.745966692 Reorder the terms: -3 + x = 7.745966692 Solving -3 + x = 7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 7.745966692 + 3 Combine like terms: -3 + 3 = 0 0 + x = 7.745966692 + 3 x = 7.745966692 + 3 Combine like terms: 7.745966692 + 3 = 10.745966692 x = 10.745966692 Simplifying x = 10.745966692

Subproblem 2

x + -3 = -7.745966692 Simplifying x + -3 = -7.745966692 Reorder the terms: -3 + x = -7.745966692 Solving -3 + x = -7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -7.745966692 + 3 Combine like terms: -3 + 3 = 0 0 + x = -7.745966692 + 3 x = -7.745966692 + 3 Combine like terms: -7.745966692 + 3 = -4.745966692 x = -4.745966692 Simplifying x = -4.745966692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.745966692, -4.745966692}

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